My OCD or whatever, is compelling me to eXpand upon, and structure this better. So in order to get it out of my system... from oldest to youngest, in groupings:
The "Patriarchs & Matriarch(s)": Magneto, Xavier, & Moira...
Mystique?
The "Teacher" (Mentor) "Class": Logan, Cable, Forge, Banshee, Bishop, Frenzy, Emma, Sage, & Domino...
Deadpool?*
The "BIG Brothers & Sisters": Beast, Northstar, Archangel, Storm, Cyclops, Psylocke, & Sunfire
The "Middle Children": Longshot, Jean, Nightcrawler, CeCe Reyes, Gambit, Havok, & Dazzler
The "Babies": Colossus, Rogue, Polaris, & Iceman... Rachel, Kitty, & the New Mutants/X-Force alumni... Jubilee, Gen X, et al. ... Laura + the other Young & New crew
Sound about right? Suggestions are welcome!